WHOLE CHARACTER
单dān, shàn, chán
single; one (单独, 单一); simple (简单); odd-numbered (单号); a sheet; list (名单)
单 is single — one alone, a simple sheet, a name list.
The header calls the formation 象形; the modern stacked pieces are shown visually without a historical story.
TOP PIECE (丷)
丷
Notice this part of the shape; it is not taught as a separate word in this lesson.
In 单: top piece (丷) The two-dot top; no role is claimed.
MIDDLE PIECE (日)
日rì
sun; day
日 gives a sun/day/time clue in combined characters.
In 单: middle piece (日) The middle field piece; no historical role is claimed.
BOTTOM PIECE (十)
十shí
ten
Described structurally in 早; no invented story.
In 单: bottom piece (十) The bottom cross piece.